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HappyChain Documentation Hub

HappyChain is a blockchain focused on onchain games and social apps. We help solve challenges in building and distributing these demanding applications.

Applications on HappyChain use the Happy Wallet to onboard users in seconds:

  • No need to install anything — the wallet is embedded in your app
  • No need to secure a seed phrase — users can log in with their social account (the wallet remains noncustodial)
  • No need to pay for gas — via gas sponsorship, so no need to bridge funds to start playing

The HappyWallet also supports session keys, enabling your app to sign transaction on the users behalf (no more confirmation popups) after the user approves a session key for a given contract.

HappyChain is a layer 2 blockchain that settles to Ethereum, with Celestia underneath for data availability.

You can learn more about what HappyChain is and our vision on our Mirror blog.

For App Devs

  • Chain Information — Handy information & links to work with HappyChain (chain ID, RPC servers, block explorer, faucet, ...)
  • Happy Wallet SDK — How to integrate the Happy Wallet in your application — it's dead easy.

Infrastructure

These are open-source tools and utilities that we build for our internal needs but make available to everyone. App builders most likely won't need those.

Our Boop account abstraction stack provides all the convenience of account abstraction (key rotation & recovery, gas sponsorship & gas abstraction, delegation & session keys, extensibility) in a software form-factor that enables low latency blockchain interactions, implementation simplicity, and superb reliability.

We maintain all sides of the stack: contracts, submitter (relaying transactions & more), and a client-side SDK for easy interactions with the stack from JavaScript and TypeScript.

Incubating

Stuff that's not quite ready yet, but for you to preview :)

  • TXM (Transaction Manager) — Our WIP transaction manager, which makes submitting transactions super reliable and takes care of everything that could go wrong. It also allows custom fine-grained policies for handling issues in the transaction lifecycle. TXM is already running on HappyChain Sepolia, where it is the backbone of our randomness solution.

  • Happy Randomness — Our unique VRF solution to provisioning provable onchain randomness, built on top of TXM and the Drand network. Besides the traditional request-response model, Happy Randomness uniquely provides "synchronous randomness" — provable random numbers by making a contract call. Documentation coming soon.